: Modern ZIP formats can detect when multiple files within an archive point to the same data block, preventing the recursive explosion. Summary Table Description File Type Zip Bomb (Decompression Bomb) Primary Goal Resource Exhaustion (DoS) Method Recursive compression and pattern repetition Max Size Can reach Petabyte scale ( 101510 to the 15th power Risk Level High for unpatched/automated systems (5) SPECIFICATION(S) NOTE TO TENDERERS:
: When a user or a server-side process attempts to decompress "nickel.zip," the system's hard drive space is instantly filled, and the CPU reaches 100% utilization.
: 42.zip was a 42-kilobyte file that expanded to 4.5 petabytes (4,503,599,627,370,496 bytes) of data. nickel.zip
: By "distracting" the antivirus scanner with the massive decompression task, other real malware may sneak past the scanner while the system is bogged down. 4. Modern Defenses
: Scanners are now programmed to stop looking after a certain number of layers (e.g., 5 or 10 deep). : Modern ZIP formats can detect when multiple
: The name "Nickel" likely refers to the small "size" of the initial coin (5 cents) compared to the massive value it "contains" once opened, or simply a modern alias for similar recursive archives. 2. Technical Mechanics
: If the software detects that a 1MB file is trying to expand into 1GB, it will flag the file as a "Decompression Bomb" and halt the process. : By "distracting" the antivirus scanner with the
: Antivirus software and automated scripts often try to "peek" inside archives to scan for viruses. A zip bomb forces these scanners to keep diving deeper into layers, eventually consuming all available RAM and CPU cycles. B. Identical Data Compression